Zygosity testing determines if the fetuses are identical or fraternal in a multiple gestation pregnancy. Zygosity testing is ordered for complicated multiple gestations.
CPT Codes:
83891(1), 83900(2), 83901(9), 83912(1), 83909(2)
Specimen Requirements:
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Blood:
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Please Note: Call a laboratory genetic coordinator prior to obtaining any specimens.
- ACD-A (yellow-top) or EDTA (lavender-top) tube.
- Adult: 20 ml whole blood.
- Child: 5-7 ml whole blood.
- Turnaround Time:
10-14 days
- Prenatal:
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Please Note: Parental specimens may be required. Call a laboratory genetic coordinator prior to obtaining any prenatal specimens.
- Discard first 2 ml; then 10 ml amniotic fluid in 15 ml orange screw-top polypropylene tube, 10-15 mg chorionic villi in laboratory-provided screw-top tubes with sterile transport medium or one T-25 flask of confluent fetal cells.
- Additional specimen must be obtained for back-up culture at one of our cytogenetics laboratories or another facility.
Client Services:
Reproductive/Genetics
800-848-4436
Specimen Services/Pickup:
877-246-1226